Prosthetic knee



FIG. 1 is a front perspective view showing a new design for a prosthetic knee;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines that consist of repeating dashes, where shown, depict portions of the prosthetic knee that form no part of the claimed design. The broken lines that consist of repeating segments of two dots followed by a dash illustrate seam lines, which form no part of the claimed design. 

CLAIM I claim the ornamental design for a prosthetic knee, as shown and described. 